Bug Description

This is on a Dell XPS 13 9350 DE running ubuntu 16.04.
This laptop has a touchpad and a touchscreen.
I'm reporting here about the touchpad.

One can see from Xorg.0.log and "xinput list" that *two* touchpads are registered by the system

one is called "DLL0704:01 06CB:76AE Touchpad"
and the other "SynPS/2 Synaptics TouchPad"

As a result, syndaemon is not working.
To check this, open two terminals, press and hold some key, like "e" in one of them. It starts filling with "eeeeeee". Now while holding the key, use the touchpad to tap on the other terminal. Then "eeee" fills the new terminal.
Expected behaviour:
tapping on the other terminal should have no effet, the "e"'s should continue to fill the first terminal.

Moreover, configuring the touchpad with synclient is not working either.

FIX:

Since invoking
xinput disable "SynPS/2 Synaptics TouchPad"
has no effect, it is clear that this one is a "false" touchpad.

Hence this fix is:
Add an "ignore" section in /usr/share/X11/xorg.conf.d/50-synaptics.conf

I'm sorry I'm not used to reporting bugs.
After I received the email telling me to "apport-collect 1591669"
I did it, but then I realized I had already implemented the "fix"...
So I have removed the fix, rebooted, and re-run "apport-collect 1591669"

Have a XPS 13 9350 DE and looks like I'm affected by the same issue and also suspend/resume removes the device. Yet I have several issues and it doesn't seem to matter whether the 'fake' touchpad was removed by suspend/resume.

For me too the mouse isn't disabled when typing but this is only sometimes a problem. It seems there is some other heuristic going on which prevents accidentially moving the mouse (palm detection?). Other times though it's a problem and I haven't figured out what this depends on.

But my main problem is that the middle mouse emulation never worked for me, just never isolated this enough to fill an issue. Going to test some newer kernels too, maybe this is related to this issue here too.

I'm having the same bug (ie. can't seem to disable touchpad while typing) on a Dell 5520 Precision
with Ubuntu 16.04. I did have two touchpad entries, disabled one as above, but that doesn't solve the problem.